This coterminal angle calculator converts an angle in degrees or radians into two positive co-terminal angles, and two negative co-terminal angles.
Coterminal Angle Formula
Co-terminal angles are easy to calculator using the following formulas if in degrees.
Positive Coterminal Angle = Angle + 360
Negative Coterminal Angle = Angle -360
The formulas above would only yield one of each co terminal angles. In reality there are an infinite number of co terminal angles. The definition is simply an angle that ends at the same point as another angle on a the coordinate plane. Since the coordinate circle has as a total rotation of 360 degrees, adding or subtracting that to the angle yields a result as does the coterminal angle calculator above.